<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="./js/jquery-3.6.0.js"></script>
  </head>
  <body>
    <ul>
      <li>data</li>
      <li>data</li>
      <li>data</li>
      <li>data</li>
      <li>data</li>
      <li>data</li>
    </ul>
  </body>
</html>
<script>
  // param1 mouseover  param2 mouseout
  $('li').hover(
    function () {
      $(this).css('background-color', 'blue')
    },
    function () {
      $(this).css('background-color', '#fff')
    }
  )
</script>
